<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .leo {
            width: 100px;
            height: 100px;
            background: deepskyblue;
        }

        .sky {
            width: 100px;
            height: 200px;
            background: #e79b04;
        }
        .bg {
            width: 100px;
            height: 100px;
            /*background: url();*/
        }
    </style>
</head>
<body>
<div class="leo"></div>
<div class="sky"></div>
<div class="bg"></div>
</body>
</html>